An old person is unable to see clearly nearby objects, as well as distant object.
(a) What defect of vision is he suffering from?
(b) What kind of lens will be required to see clearly, the nearby as well as distant objects? Give reasons.
(a) The old man is suffering from presbyopia.
(b)
- Bifocal lens is required.
- Reason: The upper position (Concave lens) facilitates distant vision and the lower part (Convex lens)’ facilitates near vision.